Resolved! STM32G0 USART3 and USART4 share an interrupt. How to deal with it?
void USART3_IRQHandler(void) is incorrect, since USARTs 3/4 share the interrupt, it doesn't compile. What replaces 'USART3' in the interrupt handler?NVIC_ClearPendingIRQ(USART3_IRQn); is incorrect since USART3 3/4 share the interrupt. What replaces '...